1  /* Multiple versions of wcscpy.
       2     All versions must be listed in ifunc-impl-list.c.
       3     Copyright (C) 2017-2023 Free Software Foundation, Inc.
       4     This file is part of the GNU C Library.
       5  
       6     The GNU C Library is free software; you can redistribute it and/or
       7     modify it under the terms of the GNU Lesser General Public
       8     License as published by the Free Software Foundation; either
       9     version 2.1 of the License, or (at your option) any later version.
      10  
      11     The GNU C Library is distributed in the hope that it will be useful,
      12     but WITHOUT ANY WARRANTY; without even the implied warranty of
      13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14     Lesser General Public License for more details.
      15  
      16     You should have received a copy of the GNU Lesser General Public
      17     License along with the GNU C Library; if not, see
      18     <https://www.gnu.org/licenses/>.  */
      19  
      20  /* Define multiple versions only for the definition in libc.  */
      21  #if IS_IN (libc)
      22  # define __wcscpy __redirect_wcscpy
      23  # include <wchar.h>
      24  # undef __wcscpy
      25  
      26  # define SYMBOL_NAME wcscpy
      27  # include <init-arch.h>
      28  
      29  extern __typeof (REDIRECT_NAME) OPTIMIZE (evex) attribute_hidden;
      30  
      31  extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2) attribute_hidden;
      32  
      33  extern __typeof (REDIRECT_NAME) OPTIMIZE (ssse3) attribute_hidden;
      34  
      35  extern __typeof (REDIRECT_NAME) OPTIMIZE (generic) attribute_hidden;
      36  
      37  static inline void *
      38  IFUNC_SELECTOR (void)
      39  {
      40    const struct cpu_features* cpu_features = __get_cpu_features ();
      41  
      42    if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX2)
      43        && X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, BMI2)
      44        && X86_ISA_CPU_FEATURES_ARCH_P (cpu_features, AVX_Fast_Unaligned_Load, ))
      45      {
      46        if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512VL)
      47  	  && X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512BW))
      48  	return OPTIMIZE (evex);
      49  
      50        if (X86_ISA_CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_VZEROUPPER, !))
      51  	return OPTIMIZE (avx2);
      52      }
      53  
      54    if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, SSSE3))
      55      return OPTIMIZE (ssse3);
      56  
      57    return OPTIMIZE (generic);
      58  }
      59  
      60  libc_ifunc_redirected (__redirect_wcscpy, __wcscpy, IFUNC_SELECTOR ());
      61  weak_alias (__wcscpy, wcscpy)
      62  # ifdef SHARED
      63  __hidden_ver1 (__wcscpy, __GI___wcscpy, __redirect_wcscpy)
      64    __attribute__((visibility ("hidden"))) __attribute_copy__ (wcscpy);
      65  # endif
      66  #endif